Full oscillation cycle phase noise analysis of differential CMOS LC oscillators |
| |
Authors: | Niklas Troedsson Henrik Sjöland |
| |
Affiliation: | (1) Department of Electroscience, Lund University, Box 118, 221 00 Lund, Sweden |
| |
Abstract: | This paper analyzes the phase noise of the widely used differential LC oscillator topology and presents brief equations describing phase noise over the entire oscillation period. The findings show that if a capacitance is present at the source node of the differential pair, two phenomena occur that increase the phase noise: the switch time increases, lengthening the interval spent in a noisy balanced state and increasing the transistor noise excess factor; and at higher frequencies the unbalanced state starts to contribute phase noise. The analysis is based upon the superposition of piecewise linear equations using the EKV transistor model, which includes a concise formulation of the noise excess factor. |
| |
Keywords: | CMOS Voltage controlled oscillators Phase noise |
本文献已被 SpringerLink 等数据库收录! |